source: mpd-status/trunk/examples/status-actions-menu @ 52

#!/usr/lib/9base/bin/rc
# periodically print stuff to the bar

PIDFILE=/tmp/.ixp-$USER/statuspid-$WMII_IDENT
if(test -r $PIDFILE) {
    kill -2 `{cat $PIDFILE} >[2]/dev/null
}
echo $pid >$PIDFILE

# current track playing in mpd

# Implement many of mpc's actions in a menu
wmiir create /menu/items/mpc/prev 'prev'
wmiir create /menu/items/mpc/play 'play'
wmiir create /menu/items/mpc/pause 'pause'
wmiir create /menu/items/mpc/stop 'stop'
wmiir create /menu/items/mpc/next 'next'
wmiir create /menu/items/mpc/toggle 'toggle'
wmiir create /menu/items/mpc/start 'seek 00:00:00'
wmiir create /menu/items/mpc/back 'seek -00:00:05'
wmiir create /menu/items/mpc/fwd 'seek +00:00:05'
wmiir create /menu/items/mpc/clear 'clear'
wmiir create /menu/items/mpc/shuffle 'shuffle'
wmiir create /menu/items/mpc/load 'load wmii'
wmiir create /menu/items/mpc/save 'save wmii'
wmiir create /menu/items/mpc/voldn 'volume -10'
wmiir create /menu/items/mpc/volup 'volume +10'
wmiir create /menu/items/mpc/repeat 'repeat'
wmiir create /menu/items/mpc/random 'random'
wmiir create /menu/items/mpc/update 'update'

mpdlab=`{wmiir read /bar/new}
# Colour between selected and normal
wmiir write /bar/$mpdlab/fgcolor '#d4d4d4'
wmiir write /bar/$mpdlab/bgcolor '#293139'
wmiir write /bar/$mpdlab/bordercolor '#303840'

wmiir write /bar/$mpdlab/b1press 'extern mpc toggle'
wmiir write /bar/$mpdlab/b2press 'wmiir write /menu/precmd ''extern mpc''; wmiir write /menu/lookup /items/mpc; wmiir write /menu/ctl ''display 1'''
wmiir write /bar/$mpdlab/b3press 'extern mpc next'

# When changing the volume, display it
# (Involves calling bash because I don't really know how to do 9rc)
wmiir create /bar/$mpdlab/x-delay 0
wmiir write /bar/$mpdlab/b4press 'wmiir write /bar/'^$mpdlab^'/x-delay 1; extern bash -c ''wmiir write /bar/'^$mpdlab^'/data "$(mpc volume -5 | grep ^volume:)"'''
wmiir write /bar/$mpdlab/b5press 'wmiir write /bar/'^$mpdlab^'/x-delay 1; extern bash -c ''wmiir write /bar/'^$mpdlab^'/data "$(mpc volume +5 | grep ^volume:)"'''

# date and load average

label=`{wmiir read /bar/new}
wmiir write /bar/$label/b1press 'wmiir write /wm/ctl ''select prev'''
wmiir write /bar/$label/b3press 'wmiir write /wm/ctl ''select next'''
wmiir write /bar/$label/b4press 'wmiir write /wm/ctl ''select prev'''
wmiir write /bar/$label/b5press 'wmiir write /wm/ctl ''select next'''

# install signal handler for artificial sigexit:
fn sigint {
    if(test -f $PIDFILE && ~ `{cat $PIDFILE} $pid)
        rm -f $PIDFILE
    wmiir write /bar/ctl 'destroy '^$mdlab
    wmiir write /bar/ctl 'destroy '^$label
    exit
}

fn mpdstatus {
    echo (`{$HOME/.wmii/scripts/mpd-status.py})
}

fn statustext {
    # if you need a formatted date, use awk
    echo (`{date} `{uptime | sed 's/.*://; s/,//g'})
}

mpdtext=`{mpdstatus}
text=`{statustext}
while(wmiir write /bar/$label/data $"text >[2]/dev/null) {
    sleep 2
    text=`{statustext}
    # If we've been told to delay, don't update this time round
    delay=`{wmiir read /bar/$mpdlab/x-delay}
    if(~ $delay 1) wmiir write /bar/$mpdlab/x-delay 0
    if not {
        mpdtext=`{mpdstatus}
        wmiir write /bar/$mpdlab/data $"mpdtext >[2]/dev/null
    }
}